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There are various buildings within the assembly plant. The south portion of the plant contained three buildings. The southernmost one was the smallest, containing a manning station for the various engineers. The building to the east was a large compound containing a huge hangar two stories in height for development of various large weapons systems. The ground floor contained a room similar to that of the smaller building. The interior also contains a balcony that leads to a computer room. The eastern building is a two story building with a penthouse storage area at the top. The first story contained a large desk area for two rooms, presumably a meeting area, with one room beyond the first desk area containing a pantry. The second story contained some desks. The penthouse can be reached by ladder. Both buildings are connected by a bridge between the second floor of both buildings.

In November, 1970, the south portion of the assembly plant was used to temporarily house the stolen Metal Gear weapon, and to arm it with nuclear warheads. At night, the lights were kept on as the engineers continued their work, allowing Big Boss to more easily locate the plant. Big Boss attempted to destroy Metal Gear, before Gene and the renegade FOX unit could launch it, but instead ended up facing its prototype model, RAXA. The result of the mission was disastrous for both sides, as Gene made several of his soldiers kill each other using his hypnotic speech, and Jonathan was killed trying to defend Big Boss. In addition, because of Sokolov's involvement in Snake gaining knowledge about the ICBMG, Sokolov was imprisoned within the plant.

After procuring Saturn V documents for an informant known as "Ghost," Big Boss's resistance received intel from a spy unit at the plant, concerning an unknown person who had been locked up in the computer room. The resistance then infiltrated the plant and located the person in question, who turned out to be Nikolai Stepanovich Sokolov. The resistance discovered not only that the documents they had retrieved were actually that of the similar ICBMG booster rocket, but also Sokolov's motivations for disguising himself as Ghost. Campbell then allowed Sokolov to officially join the unit.

"Progress continues on arming Metal Gear with nuclear warheads. The work is being carried out in the south part of the plant."

―Spy report from the plant

In front of the player character's starting position, there is a pile of crates that can be climbed to reach the roof of the nearby building. From the edge of the roof, the guards below can be seen and snipe. Jump down and use the far wall to run towards the goal.

The RPG-7 is the most effective weapon to use against RAXA. Though the other characters recommend the use of TNT, successfully planting and then detonating it beneath RAXA can be quite difficult. If an RPG-7 was not procured already, one can be located in a corner of the hangar, to the far left of the player character's starting position. If necessary, other weapons besides the RPG can be used, such as the M63, M16A1, etc.

Fire at RAXA's legs, avoiding any missiles that it fires, by running towards or behind the machine, or using nearby cover. The Vulcan cannon that RAXA uses is easy to evade, so roll away in order to do so.

After 1/4 of RAXA's health bar is depleted, it will go into its second attack phase. This time, whenever the missile compartment opens, fire away at them. Get as many shots possible, for it will make life easier. After all this, RAXA will be defeated.